What is the syntax for finding the Month(number) in DB2?

I want to compare the date today (getdate() in T-SQL) to a date in a column and subtract whole months to age a record.
Example, if the last transaction date was 9/1/2008, I want to be able to say
IF LAST_TRAN_DATE >= GETDATE() -1 THEN <DoSomething> ELSE <DontDoSomething>

In this case, I would expect <DontDoSomething> because September is less than November minus 1 (October).

How would I say this in a DB2 query?

re: What is the syntax for finding the Month(number) in DB2?